Sewing machine



N. V. CHRISTENSEN i Nov. 9; 1948. l

'SEWING MACHINE' '7 Sheets-Sheet 1 Find aai-cm 15, 1945 Nov, 9, i948. N. y. CHRxsTENsEN A539139 SEWING MACHINE Filed March 15, 1945 '7 S'heets-Sheet 2 7446-@ Traa/YE Nov. 9, 1948.

Filed March l5, 1945 N. v. cHRls'rENsEN SEWING MACHINE 7 Sheets-She-et 4 Nov. 92, 194.8.

N. v. cHRls'n-ENSEN 2,453,119

.SEWING MACHINE Filed March'l,- 1945 v Nqv. 9, 1948.

N. V. CHRISTENSEN SEWING MACHINE Y Filed March l5, 1945 a fof 171 '7 Sheets-Sheet 6 IN VEN TOR.

Nov. 9, 1948. N. v. cHRlsTENsEN SEWING MACHINE Filed March 15, `1945 '7 sheets-sheet frl l1 lllllllllrfm I N V EN TOR. /I/O/PM/i/V 1./ @Wurf/SEN Trag/VE? Patented Nov. 9, 1948 i SEWING MACHliNE Norman V. Christensen, Chicago, fill., assigner to Union Special Machine Company, Chicago, Ill.,

a corporation of Illinois application March 15, 1945, serial No. 582,876

i sclaims.

"This invention relates to an improved sewing machine and more particularly to such a machine wherein one or morereciprocable and swingable thread carrying needles coact with corresponding vertical axis hoehe in the formation of lock stitches.

` One of theimportant objects of the invention is the provision, in a sewing machine ofthe type indicated, of rotaryitake-up means operatively associated with the maindriving devices of the machine in such a manner asto materially reduce noise and substantially eliminate vibration in the course of operation.

Another object of the invention is the provision of simple but effective rotary take-up means dis- A further object oi` the invention has been to provide a multiple needle, vertical axis hook lockstitch sewing machine with needle feed wherein a single rotary take-up mechanism is adapted to simultaneously manipulate `and control a separate thread for each needle. It has also been an object to provide such a take-up mechanism which is actuated by a single rotary shaft that is driven by a gear arrangement disposed within the vertical standard of the machine.

A still further object of the invention is the provision of a vertical axis hook sewing machine having at least one reciprocable and swingable needle with rotary take-up and thread controlling devices associated therewith, all constructed and arranged in a relatively simple, compact and trouble-free unitary assembly.

To the end that the foregoing objects may be attained, the instant invention comprises the sev# eral devices, mechanisms and arrangements hereinafter described in detail and illustrated in the annexed drawings of preferred machines em bodying the invention, from which the various features of the invention and the advantages obtainable by the practice thereof will be readily colnprehended by a person skilled in the art.

In th drawings: l Figure lis a view partly in frontelevation and partly in longitudinal section through a lsewing machine embodying the invention;

Figure 2 is a top planview of the machine (of Figure 1 with the top cover plate removed),A V if "Figure 3 is an inverted plan view `of themachine of Figure l with the bottom cover plate of the oil reservoir removed; i i

Figure 4 is an end elevation View of chine as seen frornthe left in Figure 1; C Figure 5 is an enlargedfront elevation view lof `the needle head portion of the machine showing the rotary takefup means, the threadipositioning `member and the multiple needle arrangement;

Figure 6 is a view of theneedle head of themachine takenalong line--B of Figure 5; l u Figurefl is an enlarged view taken along staggered line 'i-l' otliigure l and showing an idler gear partially broken away for clearer illustration of certain other parts; l i Figure 8 is a view through the base of the ma# chine taken along line il5 of Figure l; f i

Figure 9 is a View in elevation of devices adaptf ed to be carried at the free`end 'of the needle head in a machine embodying modifications of the construction sho-wn inFigures 4 and d;

Figure l0 is a side elevation viewof the devices shownl in Figure 9 as viewed from the right thereof; Figure `,l1 is a View in elevation of a combined outer cover` plate and thread guide taken along line Ii--Il of Figure 10; and ,l `Figure l2 a cross-sectional View taken along staggered line l2-l2 of Figure 11. i

Referring new to the drawings whereinflike reference numerals designate corresponding parts throughout the several views, and more particu-l larly to Figure l thereof, the main frameof the sewing machine consists of a base Illprovided` with a work supporting surface l! and carrying at one Mend a vertical hollow standard l2 from the upper end ol' which an overhanging hollow arm i3 projects over work supporting surface Il. Overhanging arm i3 carries a needle head I4 at its free end. Formed within the base as a con`- tinuation of standard l2 is a reservoir l5 having a removable bottom cover plate I6 and containing `a `supply of a suitable lubricatingoil I1." YA top cover plate it constitutes a part of over*- hanging arm it and is attached to the machine frame by a plurality of hinges I9 (Figure 2);]A pair of transverse partitions 20 and 2|` carry bearing sleeves 2i and 23, respectivelmfor journailing an osciliatable sleeve 24. Disposed within oscillatable `sleeve 2li is a pair `of spaced bearing sleeves 25 and 26 for rotatably supporting a rnain driveshaft Elin spaced relation to the inner surl` face of sleeve "24. Asviewed in Figure 1, one and OFFICE the ma@ i of shaft 27 terminates within needle head |4 while the other end thereof extends through a sleeve bearing 28 and projects beyond the exterior of the machine frame where it is attached by a set screw 29 to a combined hand wheel and pulley 39 by which the machine is driven in the usual manner.

A needle Vbar 3| having a pair of parallel needles secured to its lower end is slidable in a carrier which is generally denoted by numeral 33 and which is oscillatable, as will be hereinafter more fully described, about the axis of a shaft 34 supported at opposite ends in a pair of bearings 35 and 36 (Figure l)` and disposed in the upper portion of needle head I4. The lower portion of carrier 33 is yoked to accommodate a 4 collar 48, sleeve 24, collar 45, arm 4S, member 47, carrier 33, and needle bar 3|.

Turning next to Figures 1, 3, 4 and 8, I have illustrated therein a pair of vertical axis rotary hooks 6| carried by corresponding shafts 62 to each of which is secured a spiral gear pinion 63 that mesheswith a corresponding spiral driving g'ear'll mountedion a single'hollow shaftGS journalle-d in theusual manner in sleeve bearings 6B, 57 and 68 and restrained against axial movement by collars 69 and 79 that abut the ends of bearing sleeve 67. Shaft 65 is rotated through the coaction of a spur gear train disposed within holcollar 37 that is attached to needle bar 3| and that is provided with a laterally projecting pin 38 for connection by suitable linkage, such as a pitman 39, to a crank pin 49 of a balanced crank "41 that'is afxed to the end of drive shaft 27 within the needle head I4 by one or more set yscrews 42. From the foregoing, it will be apparent that rduring operation rotary movement of drive shaft 27 is translated by the combined action of crank 4|, pitman 39 and collar 37 into reciprocatory movement of needle bar 3| within the carrie'r' 33.

Simultaneously with the above described reciprocation of needle bar 3| and needles 32, carrier 33 and therefore needle bar 3l and needles 32 are oscillated or swung to and fro in the direction of feed about vthe axis of shaft 34 by an arrangement of apparatus that will be next described.

A collar 45,` disposed within the needle head I 4 "andsecured to one end of oscillating sleeve 24 in any desired manner, carries a depending arm 46 which is connected by a link 47 and a pin 47a to carrier 33. A second collar 48 is secured to the other end of oscillating sleeve 24 and carries a similar depending arm 49. It will be noted that Collars 45 and 48, in addition to carrying corresponding depending arms 46 and 49, respectively, serve to restrain sleeve 24 against axial projecting strap 55 that embraces an eccentric "(not shown) on drive shaft 27; and means for varying the throw of arm 49 and therefore the extent of oscillation of sleeve 24 comprising a vertically adjustable, internally threaded tubular member 56 which is coupled to fulcrum 53 by a collar 57 having a clevised arm 58, a regulating screw 59, and an adjusting knurled knob for manually actuating screw 59 from the exterior of the machine frame. The construction and operation of. mechanism 59 is set forth in detail in the Oscar Quist Patent 2,329,484 granted September *14,v 1943, to which reference may be had for a full 4-understanding thereof. It is sufiicient to point out that mechanism 59 coacts with drive shaft 27 andvupon each complete revolution thereof kimparts ar complete oscillatory movement to the carrier 33 about the axis of shaft 34. This movement is likewise imparted to theneedles32 due tothe relationship and coaction of arm 49,

lowestandard l2 and consisting of a driven gear `7|` that dips into lubricating oil |7, an idler gear As is best shown in Figure 8, a throat plate I 75 is removably attached across an opening in base I9 by screws 76 and is provided with an aperture 77 to receive and permit theoperation of a feed dog'78 that is adjustably secured toafee'd bar 79. One end of feed bar 79 is connectedv to a 'Strap link 80 that embraces an 'eccentric-18| on shaft 65. Feed bar 79 is pivotal-ly attached to the upper end of a rocker device 82 extending upwardly from a collar 83 secured'toa hollow rock shaft 84 that is parallel to hollowfshaftfiB'S and is supported in suitable bearingsf85,^'f86 and 87 in the base of the machine, and that is maintained in desired axial position byl collars;` 88an`id 89 (Fig.3). It will be observed from an inspection of Figures Sand 7 that one -end of shaft-84 projects into reservoir l5 andv carries ari-arm 90 provided with a laterallyextending 'ball stud 9| for connection to the lower end `of afpitman 1-92 that is coupled at its upper end to a bal1stud'193 projectinglaterally of'an arm 94 which is 'y attached to arm 49 by screws 95. Each complete revolution of shaft tends, throughvthe coaction of eccentric 3|, strap 89 and feed bar'79toimpart .a'generally vup and down movement tol-feed dog 78 (Figure 8). Also, each complete revolution of drive shaft 27, through the fco'action of mechanism 58, pitman'92, rock shaft-84, member 82 and feed 'bar 79,' imparts a generallylongitudinal to 4and fro movement to feeddcg 78A (Figures '7 and '8). Since the just described,fgen erally up and down movement and the generally longitudinal to and fro movement Nare' both imparted to lfeed .dog .78 simultaneously, it will abe evident that the resultant movement -of Vthefeed dog will be of the so-called four motion type, i. e., in an orbital path, and so timed with yrelation to the reciprocatory and oscillatory .movement of needles 32 as to assist the needles in feeding-work that is being sewn.

lDetails of construction of a presser footnand presser bar arrangement are illustrated in Figures 4 and 6 wherein a presser foot 9S is .disposed directly above feed dog i8 and pivoted Vat Slto the end of a leg 98 projecting from a shank member that is 'removably attached to the `lower-.end of a presser bar 99. Presser bar 99 is vertically slidable in needle headr i4 and is normally urged v downwardly by a concentric helical compression spring |90 that 'bears against the upper surface Aof a block 59| carried by the presser bar andthe lower end of externally threaded sleeve |92 that is carried by the machine frame and is adapted to be adjusted vertically through the manipulation of a knurled knob ||l3from`the exterior of the machine. A link l 94 is Ipivotally connected by means of screws H95 to a collar-|96 l"slidably mounted on the presser bar `and the'freef-endo'f fares, 11e

`arockarm l'lcarried byashaft |08 within the needle head I4. Secured to shaft |08 is a lever |09 extending horizontally outward throughthe usual opening` (not shown)` in the machine frame for :pivotal connectioniat to an actuating rod Ill '.that. is operated by an appropriate foot treadle or knee press. (not shown). At the time the Work A.sinitially placed in the machine, rod I I is urged ,downwardly therebyraising presser bar 69 and .presser` foot 96 against theaction of compression spring |00. Upon the release of rod I|| presser bar 99` and presser foot 86 arernoved downwardly .to the position shown in Figure 4 dueto the force :exerted `Icy compression spring |00. A slight clearance is normally providedbetween the block ,I Ul andsleeve |06. i,

i, The following portion ofthis description is di rected to the rotary `take-up means and its struc- `tural relation `to theother parts of the machine. `In this connection, a seconddrive gear ||5 (Figures 11 and '1) on drive shaft 21 is disposed within ,hollowl standard I2 and meshes with a driven gean I I6 also Within standard I2 and carried by `a shaft ||1, parallel to drive shaft 21, rotatably mounted in sleeve `bearings IIB, IIE! and |20, and `maintained indesiredaxial position by a pair of `collars |2| and |22 abutting opposite ends of bear- `ing sleeve H9. Secured to the left end of shaft ||1, asV viewed in Figure `l, is a rotary take-up mechanism `|25 constituting the sole needlethreadtake-up means of the machine and'in- Igcluding `a double-lobed cam plate |26 and a slot- `,ted take-up element |21 projecting laterally of -carn plate |26 and carried through an orbital path, upon rotation of shaft I I 1. `The construction and `operation of mechanism |25, including cam plate |26 and `slotted take-up element |21, may he the ,same as` for the corresponding parts of the rotary `take-up device described in detail in Charles F. Rubel patent 2,400,602, entitled SewingMachine and granted May 2l, 1946. Forfurther details as to mechanism |25reference may be `had `to that patent. ,Attached to needle head|4 to close` the free end thereof and to contain take-up mechanism |25, is` a housing consisting of a needle head `closure plate |28 provided with a flange |26 slotted at |30 to permit cam plate 26 to project therethrough during operation. Secured to flange |29 .by screws ,|3I is a partial cover |32 arranged in spaced relation to rotarytake-up mechanism |25 `and so formed as to permit of ready manipula- `tion of needle thread in the course of threading `the machine. `A combined `thread positioning `and.removingdevice |33 is adjustably mounted f .on flange |20 and is maintained in predetermined `relation to a thread cutting element |34 (Figure 4). ,A portion `of device |33 is adapted to pass ,through the slot in takeup element |21 in the course of its orbital movement-,and is so con- `'structedrand arranged as to'force outwardly beyond the free endof take-up element |21 any needle thread or threads that may become improperly engaged therewith due to breakage.v `Needle thread so forced` outwardly beyond `the free end of slotted` take-up element |21 is thereupon drawn against and severed by cutting elementISI. Reference may be had to Charles F. Rubel Patents No. 2,440,615 granted April 27, 19,48, andNo, 2,446,245 granted August 3, 1948, whereinthe details of construction and manner gtoperation of `thread positioning and removing `member |33 and thread cutting element |34,` respectively, are fully` set forth.

threads l |35 (ltgure.` `2); from faconvenient sourde of supply (notishown) isintroduced into the machine throughu a? pair `of` eyelets |36 in the L rear of overhangi'ng arm I3 and is `then passed through and around a pair of combined thread guiding and tensioning devices |31 disposed within overhang# ing arm |3 :andsupported on a bracket |33;I Both `threads i are next passed around a thread guiding "devicel39 adjustably mountedon a bracket f"|40 `The nedlethreads arethen engaged by take-up element |21 and/or by thread positioning device |33, depending on: their relative uposition, and passedfthrough separate openings (not shown) in abracket1|48 attached to carrier 33, from whence i they; are passed` through the eyes ((not shown) oineedles"32.'v l i i @i Turning next to Figures `912, inclusive, I have illustrated therein several devices that: constitute additions andmodications of parts earlier"de scribed herein.` `These devices` are depicted in one relative assembled positionlin Figures 9` and 10 wherein tliereis showna plate |50, corresponding to plate |28 of Figures 1 and 4, `which serves as a closure for the freeend of the needle head ofthe machine andis adapted to `be attached theretobyaiseries of screws.1 |5| Plate,|50,is formed with a laterallyprojectingflange |52, includingfa flattened portion |53 that is slotted at |55 (Figure `10) at` the front of the machine to `permit( camplate, |26 of rotary take-up mecha.,-

, isadjustably attached to` bracket |5511by screws iii() |58andhas associated therewith athread cutting element |59 that may be thesame as or sim,- ilar to elementi 34.

Suitablymountedon plate |50Vbyscrewsor like (not shown)` is a plate |59ahavinga pair of `Flange. |52 carries apluralityfof inwardly jecting tapped lugs` |64 towhich `a gnerallylQfvshapedpartialclosurel|65 ,(Figure 9) is attached `byscrews |66 and` maintained in spaced relation to cam plate;` |26. `A combined protectiveouter t ,coverltand thread guiding plate or` device. |61` is provided withya pair of openingsL `|68 (Figure 11) for, mounting., to ,bracket |55` by means `of ,studs treading@bemesting a ,Pair 0f `.needle a5 inner `end of, device |61 is formed witha subi stantially annular groove or recess |12 for the reception lofthe freeendof take-up `element |21. `This groove servesas a racewayfor the free` end einlegen @werden its Whiteman :nient `upon rotation of. cam fplate 1326. Dei/.ice .1;6] -is disposed in :spaced relation -to partial :closure-.|65 ,andtake-up element IZ'I-andis so .con- .structed andarrangedfwith :respect @to zthe lassociated. parts von .the needle head that A'therneedle threads v| .fmay ,be ,.readilyfimanipulated `in threading 'thel machine. .'Moreoyer, :by virtue .of this construction, the threadsare y.prevtented from aslipping or moving overfandbeyond .fthe freeend of v,take-up VA.element 121 .should .the machine abe .rmadeto turn in a reverse .direction .orfor 'any :other .circumstance that ,might tend to `:effect ac- '..o'idental disengagement 4,of either'v thread :from velement |21.

l .From the-,foregoing it is believed thatthe -con- .-struction,y operation and ,advantages of :the finstant invention Will be readily comprehendedby personsskilled inthe art. `Itis tobe understood, rhowever,l that 'Various changes ;in .the construcvton .and arrangement herein .illustrated .and described Amay ybe resorted `to without departing from the spirit of this invention or :the .scope `of the-.appended claims.

.iL-ln a sewing machine having awwork support, Aa vertical :standard and an overhanging armpro- `jecting from saidA standard and extending over i-sadg work support, the combination of stitch forming` means4 including a reciprocable and iswingable'thread carrying needle andcooperating werticalxaxis hook, means :for driving said .switch Aformingmeans including Ia :shaft in said work support, a .shaft in .said overhanging arm :and: gear connections between .saicl .shafts within .sai-dfstandardrotary.take-up means mounted yadjacent said reciprocalole'needle and including a rotary member and a slotted thread engagingieleyment extending laterally `from said memberr and carriedthrough an .orbital path upon rotation thereof, a singleshaft within said overhanging .arm for rotating said take-up means, :and :gear connections in rsaid vertical standard for -driving said single shaft from one of said first mentioned Shafts, `said take-up means imparting the .sole take-up action to said needle thread.

f l2. In a sewing machine 'having a work support, .a verticalstandard and an overhanging `arm projectingffrom said standard and extending-over .said work support, the combination of stitch :forming means including a reciprocable and .-swi-ngable thread carrying needle andcooperating vehicle .axis hook, means for ldriving said stitch forming .meansincluding a drive shaft in said Aouerhanging arm, a shaft fin `said work support and gear connections between saidsha-its within said standard, rotary take-up means vmounted adjacent said'needle and including a rotary cam and a thread engaging member carried through an `orbitalpath upon rotation of said rotary cam, said threadengaging member comprising a pa-r of axiallyspaced elements extending laterally from saidrotary cam, a single shaft geared to said drive shaft in. said vertical standard for rotating'said take-up means, said take-up means imparting the-sole take-up action to said needle thread.

i 3.11m asewing machine having a work support, va Vertical standard and an overhanging arm projecting from said standard and extending over saidwork support, the combination of stitch vforming means including a reciprocable and swingable thread carrying needle and cooperating 'vertical axis hook, means for driving said 'stitch iforming means including a shaft vvin'said workjsi-ipport;V a shaft 'in said overhanging arm and'c'onnections between said shafts within said 458 standard, rotary stake-:np mica-ns :mounted'sidin- .cent said reciprocable.needleandincludjllgianoftary member.1an-dgt!l slotted ithreadxengagingnele- ,ment `extending .laterally from said .zmemhermnd carried through .an orbital maths-upon: rotation .the-reef, ,said ftakefup .means imparting theizsele .take-up action to saidxfneedleuthread, tatzxed thread .positioning :member ,arranged dio :epass .through 'the .slot said .element in the .course-nf :its .orbital movement, ,said -zthrea-d :positioning :member being -constructedtand .arranged toi/force :outwardlybeyondahelfreetend ofsaid-:elementainy l4. --In .a .sewing .machine fhaving .'afwonk'fsuppont,

a vertical .standard and an overhanging'arm girjecting from .said standard :and L'extendingover said `work support, v.the combination fof/stitch forming means including .a plurality .of recipror'cable-and swingable .thread carrying Lneedlesaanizl cooperating vertical axis hooksf-means for dri-ving said stitch forming means includingashaft in said overhanging arm, a shaft/in said work supportand connections .between said 'shafts .within said standard, rotary take-up'fmeans mounted adjacent .said recipro-cable n-eedlesand including a rotary :mem-ber and a slotted-'thread engaging elementy extending 'laterally ltrom-said zmemb er and carried -througlian orbitall pathn upon rotation thereof, said taker-up fmeans -imparting' the sole take-up .action to said needle lthreaclspa member =for positioning said needle thre'adsdisposed in fixed spaced relation to said takeup means and arranged to pass ythrough the'islot'f-in said element :in the cou-rse of its-orbita1`imoyeg ment, said thread positioning-memberbeingrcon- -stiucted and arranged to force outwardly beyond the yfree -end of said element Aany of said needle threads that may become improperly lengaged therewith due to breakagewithout correspondingly affecting any other of said needle threads, and a single shaft connected with saidshaftin `said Voverhanging arm for lrotating saidv taire-'up means. y

I5. In a sewing machine having fawork support, .a vertical standard andan overhanging-arr'n-iprojecting from said standard and extending Yover Vsaid work support, the combination Acof stitch `forming Ameans vincluding a `plurality lor" recipro- .eable and swingable .thread carrying needles and cooperating yvertical 4axis hooks, means for driving lsaid stitch forming means including A4a` drive shaft f in said overhanging arm, `a vdr-iven shaft in said work lsupport and connections between said shafts within 4said standard, rotary -takeup means mounted `adjacent; said reciprocable needles and including a rotary `member and l'a'islotk ted thread engaging element extending laterally 'from said member and-carried throughani-orbi- Ital path upon rotation thereof, said take-up means imparting the sole Ytake-up action 1to l'said vneedle threads, a mem-ber "for positioning lsaid needle threads disposed in xedfspace'd :relation to said itake-up means and arrangedftopas's through the slot in said element in the Acourseo'f its rorbital movement, said 'thread' positioning member A'being constructedand arranged to force outwardly/beyond the free end of saidelementany of said needle threads that may become improp; erly engaged therewithdue to breakage 'without correspondingly affecting any'otherfoV said needle threads, and a single shaft geared to said drive shaft in said vertical standard for rotating said take-up means.

6. In a sewing machine having a work support, a vertical standard and an overhanging arm projecting from said standard ,and extending over said work support, the combination of stitch forming means including a plurality of reciprocable thread carrying needles and cooperating vertical axis hooks, means for driving said stitch forming means including a shaft in said overhanging arm, a shaft in said work support and connections between said shafts within said standard, rotary take-up means mounted adjacent said reciprocable needles, said take-up means ycomprising a cam member and an orbitally movableelement adapted to cooperate simultaneously with all of the needle threads, and a single shaft connected with said shaft in said overhanging arm for ro` tating said take-up means, said take up means imparting the sole take-up action to said needle threads.

7. In a sewing machine having a work support, a vertical standard and an overhanging arm projecting from said standard and extending over said work support, the combination of stitch forming means including` a plurality of reciprocable thread carrying needles and cooperating vertical axis hooks, means for driving said stitch forming means including a shaft in said overhanging arm, a shaft in said work support and connections between said shafts within said standard, rotary take-up means mounted adjacent said reciprocable needles, said take-up means comprising a cam member and an orbitally movable element adapted to cooperate simultaneously with all of the 10 needle threads, means for directing said needle threads across the edge of said cam member and thence -radially inwardly into the path of said element, and a single shaft connected with said shaft in said overhanging arm forrotating said take-up means, said take-up means impartingthe sole take-up action to said needle threads.

8. In a sewing machine, a work support, a. closed hollow standard having a reservoir for lubricant therein, an overhanging arm projecting from said standard and extending over said work support, stitch forming means including a reciprocable thread carrying needle and cooperating vertical axis hook, means including a rotary drive shaft in said overhanging arm for imparting recprocation `to said needle, means including a rotary shaft in said Work support for actuating said hook, rotary take-up means mounted adjacent said needle, a single shaft in said overhanging arm for rotating said take-up means, and a gear train wholly disposed within said standard, extending into said reservoir, and operated by said drive shaft for simultaneously rotating the remainder of said shafts,

NORMAN V. CHRISTENSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 549,171 Tripp Nov. 5, 1895 2,314,513 Parry Mar. 23, 1943 2,329,484 Quist Sept. 14, 1943 2,400,602 Rubel May 21, 1946 PatentNo.2,453,119.

Certificate of Correction NORMAN V. CHRISTEN SEN Itis hereby certified that errors appear in the printed specification of the above i numbered patent requiring correction as follows:

Column 7,` line 32, claim 1, for the Word switch read stitch; line 52, claim 2, for vehicle reed verhaal;

and that the said Letters Patent should be read with these corrections'therein that the same may conform to the record of the case inx the Patent Olioe.

Signed and sealed this 15th day of March, A. D. 1949.

THOMAS F. MURPHY,

Assistant Commissioner of Patents.

November 9, 21948. 

